This Teen Tennis Star Dishes on Playing Serena Williams!

Imagine being just a teenager and facing Serena Williams in the biggest match of your life. Serena. Freaking. Williams. Teen tennis phenom Sloane Stephens tells us exactly what it's like!

The 19-year-old recently went up against Williams, her longtime idol, at this year's Australian Open after advancing to her first Grand Slam semifinals—and beat her.

"It was definitely a crazy experience to be on such a big stage playing someone I've always admired," Stephens said. Playing her was one thing, but actually beating her? As Stephens put it, "It was a game changer for me."

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"It was definitely tough but I was glad that I won," Stephens said. After the game, Williams told her she did a good job and wished her good luck.

Not that she needs it—the superstar athlete from Florida is tearing up the tennis circuit and is currently ranked 16th in the WTA rankings. So you guessed it, 16th in the world. That's pretty major!

Playing in front of thousands of people and facing one of the greatest tennis players in the world takes a lot of guts and confidence, so we asked Sloane to tell us her number one confidence trick. It's so simple, you can try it, too:

"When I wake up in the morning and I'm getting ready to practice, I look at myself in the mirror and say, 'Yes, this is what I work out for. I'm the bomb!'"

Besides gearing up for upcoming Grand Slams, Stephens has also teamed up with Johnson & Johnson for their Donate a Photo mobile app to help raise awareness of sports injuries. Learn more about it here!

Who is your sports hero? Do you have any confidence tricks? Tell us in the comments!